CN202039786U - Connecting structure for high-pressure well completion oil pipe - Google Patents
Connecting structure for high-pressure well completion oil pipe Download PDFInfo
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- CN202039786U CN202039786U CN201120118777XU CN201120118777U CN202039786U CN 202039786 U CN202039786 U CN 202039786U CN 201120118777X U CN201120118777X U CN 201120118777XU CN 201120118777 U CN201120118777 U CN 201120118777U CN 202039786 U CN202039786 U CN 202039786U
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Abstract
The utility model provides a connecting structure for a high-pressure well completion oil pipe. The connecting structure comprises an oil pipe and a collar which are connected in a screwed manner; the end part of the oil pipe is thickened and is provided with an external thread; the collar is provided with an internal thread; the external thread at the end part of the oil pipe comprises a thread part and a seal part for preventing high-pressure oil gas from leaking; the external thread at the end part of the oil pipe and the internal thread of the collar adopt barb-shaped taper threads; main seal structures composed of conical seal surfaces and torque shoulders are arranged on the internal thread and the external thread; the axial interference of the threads is 2.5-10 mm; the conical seal surfaces adopt a conical surface-conical surface seal; and the semi-angle of the seal surface is 10 to 20 degrees. The utility model has the benefits that the length of a complete thread is lengthened, so that the connecting strength of the buckle-shaped connecting structure for the oil pipe is reinforced, the interference fit stress of the local oil pipe in the make-up or break-out processes can not be too large, the friction path is shorter, and the phenomenon of thread gluing can not occur; and inner bores at the male end and the female end are parallel and level to avoid turbulent flow of oil gas in the transmitting process, so that the transmission resistance is decreased.
Description
Technical field
The utility model relates to a kind of syndeton of high-pressure completion oil pipe.
Background technology
The oil pipe tubing string adopts screw thread that single oil well pipe is formed by connecting, and the screw connection point of tubing string is weak key link.In general API standard, the type of attachment that oil pipe adopts the round thread external upset (EU) or do not thicken.These types of attachment are guaranteeing all there is certain problem aspect tubular column structure integrality and the sealing integrity.For example, do not thicken the round thread oil pipe, its intensity that is threaded only is 60%～80% of body intensity, and the hydrogen sulfide acid ingredient that contains in the oil gas in addition can make common API oil pipe that stress corrosion slowly takes place.
Along with the development of petroleum industry, especially the exploitation of deep-well, ultradeep well, high-pressure gas well, directional well, sour environment well is had higher requirement to the functional performance of petroleum oil.Oil pipe and conventional special button the with API standard thread type of attachment are difficult to satisfy the production demand in many cases.Especially abominable at some oil field block corrosive environment, well depth pressure height, tubing string are given a shock bigger, use API oil pipe and conventional special the button joint to occur behind the oil pipe and lost efficacy prior to body, become the tubing string weak link, and the oil pipe life-span declines to a great extent.Think that by analysis joint anti-vibration, anti-high pressure-temperature, resistance to corrosion are lower than body, cause oil pipe deformation failure in long-term use.Thereby need a kind of oil connection that is applicable to high pressure completion of exploitation, and having high bonding strength, reliable sealing performance surpasses 10 times and goes up not thread gluing of shackle and high anti-vibration ability.Yet there are no have high bonding strength, the oil connection design of good sealing effectiveness and high anti-vibration ability.
Summary of the invention
At structural deficiency in the prior art, the purpose of this utility model provides a kind of syndeton of high-pressure completion oil pipe, it is not good to be beneficial to improve plain tubing joint bonding strength and sealing effectiveness, can't be applicable to that corrosive environment is abominable, well depth pressure height, tubing string be given a shock bigger hole condition.
For achieving the above object, the technical solution adopted in the utility model provides a kind of syndeton of high-pressure completion oil pipe, wherein: this structure comprises that box cupling that a tube end pier has externally threaded oil pipe after thick and has an internal thread is screwed and forms that the external screw thread of oil pipe tube end has threaded portion and prevents the hermetic unit that high-pressure oil gas leaks; The external screw thread of described oil pipe tube end and the internal thread of box cupling are barb-shaped taper thread, be equipped with the primary seal structure that conical seal (contact) face and torque shoulder are formed on the described internal and external screw thread, thread spindle is to the magnitude of interference 2.5～10mm, conical seal (contact) face adopts the conical surface-conical surface seal, and the sealing surface half-angle is 10 °～20 °.
Effect of the present utility model is thick by the pipe end pier, increase the length of complete thread, hook screw thread design etc. is strengthened this button-type oil tube connection structure bonding strength, follow-on pitch and tooth depth design more can be fit to the characteristics of oil pipe, the sealing surface of less screw thread magnitude of interference wide-angle and suitable stress distribution design are when guaranteeing the high-performance sealability, make oil pipe in that repeatedly to go up in the shackle process local interference stress not too large, the friction path is less, the thread gluing phenomenon can not take place.Thicker torque shoulder can guarantee not to be damaged in the situation lower contact of turning round excessively.The concordant design of male and female end endoporus makes oil gas turbulent phenomenon can not take place in transport process, reduces transport resistance.
Description of drawings
Fig. 1 is the structural representation of button oil tube connection structure of the present utility model;
Fig. 2 is the tooth form structure of button oil pipe trapezoidal thread of the present utility model.
Among the figure:
A, oil pipe B, box cupling C, screw thread D, hermetically-sealed construction
α, barb-shaped screw thread bearing surface angle beta, barb-shaped screw thread approaching face angle
H, barb-shaped thread depth
The specific embodiment
Reaching embodiment in conjunction with the accompanying drawings is illustrated the syndeton of high-pressure completion oil pipe of the present utility model.
As shown in Figure 1, the special snapping header structure of this petroleum oil comprises oil pipe A and box cupling B two parts composition, described oil pipe A part end pier is thick, the thick part of pier partly is made up of barb-shaped external screw thread C and the hermetically-sealed construction D that contains sealing surface and end torque shoulder, described box cupling B part connects between two oil pipes, the both sides symmetrical configuration comprises barb-shaped internal thread C and the sealing surface corresponding with male end nose part and torque shoulder D only.
Connect as shown in Figure 2 with the tooth form structure of barb-shaped screw thread, described barb-shaped external screw thread approaching face β is 5～45 degree, bearing surface is α-4～0 degree, difference according to the external diameter specification, male end screw thread tooth depth h is 1.016～1.575mm, pitch is respectively t=5.08 or 4.233 or 3.125mm, thread taper 1: 16.The tooth form angle of described barb type internal thread, approaching face angle, bearing surface angle, pitch, tapering are all consistent with external screw thread, and the tooth depth correspondence is respectively 1.066～1.778mm.Thread spindle is to the magnitude of interference 2.5～10mm.
External diameter after described oil pipe tube end pier is thick is greater than this oil pipe external diameter 4～15mm, and arc transition is adopted in the transition of thick part of pier and oil pipe pipe parts, and arc radius is 30～50mm.The male end of described barb-shaped taper thread flute profile is provided with the long cylinder withdrawing district of 2～8mm at run-out(of thread), the pitch of described barb-shaped taper thread flute profile is per inch five teeth or per inch six teeth-eight tooth, male end screw thread tooth depth is 1.016～1.575mm, female end screw thread tooth depth is 1.066～1.778mm, and tapering is 1: 16.
Described primary seal structure comprises described oil tube external thread nose portion and is equipped with conical seal (contact) face with box cupling internal thread corresponding position, has been equipped with the torque shoulder of shackle location in the conical seal (contact) face end on the described internal and external screw thread.
The angle of the conical seal (contact) face of described internal and external screw thread and oil pipe axis is 10～30 degree, and the angle of the described internal and external screw thread torque shoulder and the axis of thread is 70～90 degree.
One side of box cupling is twisted with the oil pipe body earlier and is received the position before dispatching from the factory, and is transported to the oil field, twists to connect with another root oil pipe again in the time of need going into the well and goes into the well, and forms airtight tubing string until the dark oil recovery gas-bearing formation of several kms.Connect in the button process stubborn, oil pipe A and box cupling B are screwed, barb-shaped external screw thread C on the oil pipe and the barb-shaped internal thread C on the box cupling screw, be combined together until beginning interference takes place and produce certain contact stress, but, therefore can not finish sealing because certain space is arranged in the middle of the male and female end screw thread C.
The sealing surface portion branch of oil pipe A and box cupling B begins to contact and take place the effect that interference reaches sealing then, end torque shoulder when contacting as oil pipe A and box cupling B at last, screw moment of torsion and stop automatically screwing when fast rise arrives the torque value that designs immediately, connect the location for providing between oil pipe A and the box cupling B to twist accurately.And since the thickness of torque shoulder after, so it is very strong to cross torque capability.Cross torque capability and can reach more than 2 times of best torque.This moment, oil pipe A and box cupling B can guarantee that bonding strength surpasses body intensity, press in being subjected to or can be not earlier during external pressure and body leak.Transfer then tubing string proceed next root oil pipe on link and connect.
Claims (5)
1. the syndeton of a high-pressure completion oil pipe, it is characterized in that: this structure comprises that box cupling that a tube end pier has externally threaded oil pipe after thick and has an internal thread is screwed and forms that the external screw thread of oil pipe tube end has threaded portion and prevents the hermetic unit that high-pressure oil gas leaks;
The external screw thread of described oil pipe tube end and the internal thread of box cupling are barb-shaped taper thread, be equipped with the primary seal structure that conical seal (contact) face and torque shoulder are formed on the described internal and external screw thread, thread spindle is to the magnitude of interference 2.5～10mm, conical seal (contact) face adopts the conical surface-conical surface seal, and the sealing surface half-angle is 10 °～20 °.
2. the syndeton of high-pressure completion oil pipe according to claim 1, it is characterized in that: the external diameter after described oil pipe tube end pier is thick is greater than this oil pipe external diameter 4～15mm, arc transition is adopted in the transition of thick part of pier and oil pipe pipe parts, and arc radius is 30～50mm.
3. the syndeton of high-pressure completion oil pipe according to claim 1, it is characterized in that: the male end of described barb-shaped taper thread flute profile is provided with the long cylinder withdrawing district of 2～8mm at run-out(of thread), the pitch of described barb-shaped taper thread flute profile is per inch five teeth or per inch six teeth-eight tooth, male end screw thread tooth depth is 1.016～1.575mm, female end screw thread tooth depth is 1.066～1.778mm, and tapering is 1: 16.
4. the syndeton of high-pressure completion oil pipe according to claim 1, it is characterized in that: described primary seal structure comprises described oil tube external thread nose portion and is equipped with conical seal (contact) face with box cupling internal thread corresponding position, has been equipped with the torque shoulder of shackle location in the conical seal (contact) face end on the described internal and external screw thread.
5. the syndeton of high-pressure completion oil pipe according to claim 4, it is characterized in that: the angle of the conical seal (contact) face of described internal and external screw thread and oil pipe axis is 10～30 degree, and the angle of the described internal and external screw thread torque shoulder and the axis of thread is 70～90 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120118777XU CN202039786U (en) | 2011-04-21 | 2011-04-21 | Connecting structure for high-pressure well completion oil pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120118777XU CN202039786U (en) | 2011-04-21 | 2011-04-21 | Connecting structure for high-pressure well completion oil pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202039786U true CN202039786U (en) | 2011-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120118777XU Expired - Lifetime CN202039786U (en) | 2011-04-21 | 2011-04-21 | Connecting structure for high-pressure well completion oil pipe |
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| Country | Link |
|---|---|
| CN (1) | CN202039786U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871324A (en) * | 2010-07-09 | 2010-10-27 | 天津钢管集团股份有限公司 | Connecting structure of special high-pressure completion oil pipe |
| CN101899953A (en) * | 2010-08-16 | 2010-12-01 | 天津钢管集团股份有限公司 | Thread joint structure for high-performance oil casing |
| CN104142292A (en) * | 2014-08-05 | 2014-11-12 | 华北电力大学 | Method for high-temperature corrosion experiments and representation of boiler superheater pipe of power station |
| CN114427626A (en) * | 2022-01-11 | 2022-05-03 | 江苏集萃碳纤维及复合材料应用技术研究院有限公司 | Connecting structure of composite material oil pipe |
-
2011
- 2011-04-21 CN CN201120118777XU patent/CN202039786U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871324A (en) * | 2010-07-09 | 2010-10-27 | 天津钢管集团股份有限公司 | Connecting structure of special high-pressure completion oil pipe |
| CN101899953A (en) * | 2010-08-16 | 2010-12-01 | 天津钢管集团股份有限公司 | Thread joint structure for high-performance oil casing |
| CN104142292A (en) * | 2014-08-05 | 2014-11-12 | 华北电力大学 | Method for high-temperature corrosion experiments and representation of boiler superheater pipe of power station |
| CN104142292B (en) * | 2014-08-05 | 2016-08-24 | 华北电力大学 | A kind of for Utility Boiler Superheater pipe high temperature corrosion experiment and the method for sign |
| CN114427626A (en) * | 2022-01-11 | 2022-05-03 | 江苏集萃碳纤维及复合材料应用技术研究院有限公司 | Connecting structure of composite material oil pipe |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190625 Address after: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Patentee after: Tianjin Steel Tube Manufacturing Co., Ltd. Address before: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Patentee before: Tianjin Steel Pipe Group Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111116 |